Word definitions
vangarara: be audaciously bold
nyimo: roundnut. bambara groundnut
Translation
One who chooses to roast roundnuts is really bold.
Inspiration for proverb
Owing to hardness of the seed, it would be surprising if one chose to roast, rather than boil, roundnuts. They remain hard after roasting and are difficult to eat.
Application
One who chooses to proceed with a problematic and potentially humiliating endeavor should be bold and unyielding. They should be prepared to deal with embarrassment, and the possibility that critics might be proved right.